Grinding machinery



April 25, 1933. F. s. HAAs Er AL GRINDING MACHINERY Filed Sept. 27, 19293 Sheets-Sheet l April 25, 1933. F, 5' HAAS ET AL y 1,905,224

GRINDING MACHINERY Filed Sept. ZZ, 1929 3 Sheets-Sheet 2 Mom/L d tto:um,

April 25, 1933. F. s. HAAs ET AL GRINDING MACHINERY Filed sept. 27, 19295 Sheets-Sheet 5 ano/r 11411 I Patented @apn 25, 1933 maar Parana#vorrica FREDMEGK HAM LEHENT BOOTH, OF CINCINNATI, OHIO, ASSGNORS TO CIN-g CENNATI QRXNDERS INCORPORATED, QF CINCINNATI, Omo, A CORPORATION OFOEE@ GRINDINe MACHINERY .Application tiled September 27, 1929. SerialNo. 395,703. i

provision of a vmechanism capable of manual or other control which willenable a rela'- l tively unskilled operator to successfully produce asmooth properly trued surface on an abrasive wheel without the formationof grooves or ridges or the like and without liability of injury to thediamond or other truing tool employed.

A turther object of the invention is the provision of an improvedmanually controllable truing mechanism for grinding Wheels or the likevvhichwill relieve the operator.

of the laborious hand actuation thereof and which will be capable ofshifting through full or limited strokes as desired and large varyingrates of speed according to the work being performed at an individualmoment.'y

An additional object of the present invention is the provision of animproved automatic mechanism 'for attaining; proper relaa tive feedingmovement ofthe tool with re spect to the surface being operated upon ateach traverse thereoi whereby uniformity of truing" and liability oideep setting causing either gauging of the wheel or damage to thediamond of truing tool to be prevented'. Other objects and advantages ofthe present invention should be apparent by reference to the following.specification considered in conjunction .with the appended drawingsforming apart thereofand it will be understood that we may make anymodifications in the speciiic structural details hereinafter disclosedwithin the scope of the appended claims Without departing from orexceeding the spirit of the invention. i

Figure lis a side elevation of a grinding machinel equipped with ourimprovements.

Figure 2 is a top plan view thereof.

Flgure 3 is a. transverse sectional view taken on the line 3 3 of Figure2.

- Figure 4 is a vertical section as'on the line 4-4 of Figure 1.

Figure 5 is a section on line 5 5 of F igure 4. y Figure 6 is a sectionthrough the actuating lever and parts affected thereby as on line 6 6 ofFigure 1. l

Figure 7 is av vertical section on the line 7 7 of Figures 2 and 3.

Figure 8' is a vertical section on yline 8 8 of Figure 7. `i

Figure 9 is a horizontal section vthrough the feed piston on line 9 9 ofFigure 8, and

Figure 10 is a diagrammatic view of the hydraulic control circuit andparts actuable thereby.

Y in the drawings infwhich similar charactcrs of reference vare employedto denote corresponding views the numerall designates the bed of acenterless grinding machine having a head 16 in which is journaled thegrinding wheel 17 actuable in a clockwise direction for operationonthe/work piece 18 supported by Work rest 19.

The present invention has been shown as applied to and utilized i-ncdnjunction with the grinding wheel Jmember of a machine of this typesince due tothe requirements as to Aaccuracy of production of Work uponcenterless grinders the truing of the grinding Wheel isof maximumimportance.

Suitably supported by the bed 15 is a bracket 20 bearing a trunnion 21for the suppemental truing fixture bracket 22 secured in angularlyadjustable position as by bolt 23. This bracket supports the guide'block24 having the dove-tailed ways 25 on 1which is slidably mounted thetubular'housing 26 for the truing tool.

Member 24 has a projection 27 forming a same from opposite ends of thecylinder to effect desired reeiprocation of piston 29. This piston iscoupled by a rod 33 with slide 26 for actuation of' the slide.

Conduits 31 and 32 terminate at the valve housing 34 containing thesuitably ported bushing 35 and slide valve 36. An inlet 37 extends tothe housing and is in communication with the interior of bushing 35,suitable actuating fluid being supplied thereto 'from reservoir 38 as byintermediately disposed pump 39. Depending from the housing is an outletor discharge conduit 40 adapted to return fluid from the system to thereservoir. The valve member 36 has a spool portion 41 engaged by arm 42on rock shaft 43 j ournaled in the valve, and having pivotally securedto its outer end the actuating handle or lever 45.

A spring 46 tends to normally urge valve to a left hand positionasviewed in Figure 5, in which the porting then serves to couple the lefthand end of the piston with the discharge port and the right hand endwith the pressure so that the actuating pressure will hold the pistonand thus the truing slide unit toward the rear of the machine in anormal, inoperative position.

When it is desired to effect a truing operation handle 45 is shifted tomove the valve to the right causing the connections to be reversed sothat the actuatingr fluid flows from the valve through conduit 32 to theouter end y of the piston while the inner end of the piston is coupledthrough conduit 31 and the valve through a discharge passage 47 in thehousing. This passage includes a seat 48 for a chuck valve 49. Thisvalve is intermediately located on the stem 50 having its terminalportions journaled in the packing nuts 51-52 to prevent leakage of theactuating fiuidl The stem being supported for both sliding and retardingmovement. Nut 51 is carried by a sleeve nut 53 having a cylindri l calportion 54 supporting and guiding the spring 55. A bushing 56 isslidably but nonrotatably mounted in the aperture 57 int-criorly of themember 53 and is urged against shoulder 58 by action of the opposite endof spring thereagainst. Stem 50 has a threaded portion 59 engaged withthe bushing whereby the stem may be adjusted relative the bushing, theengagement of the bushing and shoulder determining the inward limit ofmovement of the valve under iniuence of spring 54. These parts aremovement of the piston and thus of the truing tool in either direction.

By reference to Figures 4 and 6 it will be noted that the stem 50projects rearwardly from the housing and has its terminus restingagainst the intermediately pivoted lever member 61 whereas the oppositeend is engaged by pin 62 andl projected by engage ment of the inner faceof yoke 63 forming the pivotal connection between shaft 44 and operatinghandle or lever 45.

Consequently, when lever 45 is pushed inwardly or in a direction towardthe machine motion will be transmitted thereby through pin 62 to rocklever 61. This in turn will pressvalve stem 50 toward the front slidingbushing 56 forwardly against the pressure of spring 55 thus releasingthe choking in the discharge line. This results in a rapid traverse ofthe piston and associate tool and it will be understood that the widthof yoke 63 is such that the lever may receive the necessary valveeecting oscillationjwhile still holding the pin depressed.

Consequently, continuous or in turn rapid traverse may be effected andin either direction as the desired single lever controlling thedirectional movement of the truing tool slide and also the rate at whichthe operation is effected. I

In order that the operation of the entire machine may be as nearentirely automatic as posible means are provided not only for powerreciprocation of the truing sliele but also for au automatic inwardfeeding of the tool a predetermined amount for each cycle ofreciprocation thereof. mechanism proper is illustrated in sect-ion inFigure 7 and includes the tool holder or plunger 64 bearing at its innerend the truing tool or diamond 65. This member is keyed as at 66 againstrotation relative the support 26 therefore and has a threaded socket asat 67 to receive adjusting screw 68, Screw 68 has a flange 69 bearingagainst the under side of cap 70 carried by the outer portion of thecasing 26 and on its outer projecting end bears a hand wheel 71 forrotative adjustment of the screw. This hand wheel has a hub 72 bearingagainst a cap 73 on the outer end of the housing forming the remainderof the swivel movement of the screw and preventing longitudinalmovement. Cap 70 has a vprojecting sleeve portion 74 circumscribing theouter portion of the lscrew and forming a bearing for the oscillatablerack member 75. This member as is clearly illustratcd in Figure 8supports a pivot pin 76 The truing tool intermediately engaging pawl 77having at idly in a reverse direction and a second pin 80 serves as asupport for spring 81 normally urging the pawl into engagement with theratchet. An adjustable supply screw 33 is carried by the member 26 andprojects into the path of movementinto the rearward or spring engagedportion for engagement' of these parts upon reverse oscillation of thepawl which tends to cam the pawl inward out of engagement with theratchet and the point of release. Thus re-engagement oi the pawl andratchet on reverse movement of the pawl may bedetermined and thus theamount of shift of the ratchet may be determined by adjustment of thescrew 83. The ratchet in question is keyed on the intermediate portionof the screw so that shifting of the ratchet will correspondinglyadvance the screw therewith imparting a slow inward feeding movement tothe truing diamond.

inasmuch as in its reverse position the pawl is held back away from theratchet the screw may additionally be given manual adjustment in eitherdirection as desired.

For electing the automatic adjustment a cylinder chamber 85 is formed inthe member 26 receiving and guiding piston 86 having a rack 87 meshingwith the teeth on the pressure of the slidable pawl carrier Z7 so thaton retraction of the piston an oscillatory movement will be imparted tothe pawl. The degree'Y of feeding movement oi each oscillation mayfurther be controlled by adjusting the end stop members 88 and 89 whichhave a suitable screw or threaded mounting for this purpose as shown inFigures 8 and 9. The less the movement allowed the piston in a left handdirection the less the feeding movement which will be given to the screwupon each individual actuation of the piston. It will be noted byreference to Figures l and l0 that the leads or conduits A90 and 91 tothe cylinder 85 are coupled respectively with the leads 31 and 32 withthe cylinder 28. Consequently, the piston 86 will be moved to the rightas viewedlin Figure 8 when the piston 29 is moved to the left as viewedin Figure 3 the path being retracted r or shifted toward the rear of themachine within the lateral point grinding wheel so same is set to trueoli' the surface of theI wheel so that the wheel is worn greater at thefront than at the rear side. rlhe tool may be taught to traverse thewheel until the stock and control 35 is pressed inward causing a rapidreverse or `return movement of the tool on account of relieving foropening of the throttle valve 49.

This also carries the pawl back in a position to take another feed biteon the screw ratchet. When the machine is reversed the tool is againmovedl inward and adjusted the predetermined increment and is thencaused to traverse the grinding wheel surface at the rate determined bythe lever 35.

From the foregoing description the operation of the present improvedinvention should be readily understood and it would seem the operator isrelieved oi the necessity of slow hand traversing of the diamond and.the additional necessity of manual determi- Sti n addition., the truingtool is automatically fed in once tor each cycle et back and forthmovement of the tool. irrespective ot the extent of such movement and inany event, is given but one feeding movement for each reciprocation.lltwill ot course be understood that by a jiggling of the lever 'thepiston could be relatively shifted to reduce several operativeactuations et the eed control system without bringing the tool intoengagement with and transversely of the grinding wheel surface andlikewise that such desired' additional adjustment could be procurred aspreferred by a manual adjustment of the truing tool by rotation oi"handle 71 and thus associate screw without actuation of the hydraulicmechanism;

We claim z;

l. A mechanism ot the nature described including a support, a slidemovable traversely of the support, a tool holder movable transversely ofthe slide, a piston for actuation yof the slide, a second piston foractuation of the tool holder, respective cylinders operativelysupporting the pistons, a source of hydraulic power, and means forsimultaneously coupling the source of power with one end or l the otherof each of the cylinders for simultaneous actuation ot the feed andtraverse controlling pistons whereby the tool is incremently fed towarda grinding wheel at the initiation of the movement of the slide.

2.A ln a truing mechanism of the class described tor operation on anabrasive wheel, the combination of a supporta slide traversely movableon the support, a holder carried by the slide, hydraulically actualolemeans for effecting a traversing movement of the slide, hydraulicallyactuable means for e'ecting a continuous incremental iceding of theholder with respect to the slide, an hydraulic circuit for thehydraulically actuable means including a start and stop valve, athrottle mechanism for normally retarding the rate ot actuation of theparts including a valve, and a single control niember for determiningthe eiiective position of both of said valves.

3. In a truing mechanism of the character described for operation on auabrasive Wheel, the combination of a support, a slide traversely movableon the support, a holder carried by the slide, hydraulically actuablemeans :tor eecting a traversingmovement of the slide, hydraulicallyactuable means for eiiecting a continuous incremental feeding of theholder with respect to the slide, an hydraulic circuit for thehydraulically actuable means including a start and stop valve, athrottle mechanism for normally 'retarding the rate of actuation oftheparts including a valve, and a single control member actuable in onedirection to determine the direction of movement of the traversing andfeeding mechanisrns and in a different direction to effect the rate ofactuation thereof.

4l. ln a truing mechanism of the character described for operation onthe active face of an abrasive wheel, the combination with a support, ofa slide movable thereon, a trueing tool carried by and movable relativeto the slide toward the abrasive wheel, hydraulically actuable means fortraversing the slide, additional hydraulic means for advancing the toolrelative to the slide at incremental rates, and means controlling theactuation of the parts by the hydraulic means for movement at feed andquick traverse rates.

5. ln the machine tool organization the combination of a bed, a grindingwheel rotatably supported thereby, a bracket adjacent the grinding wheeland having a guide way thereon, a slide supported by the bracket andmovable longitudinally of the guide way, Y

a truing tool holder on the slide and movable transversely thereof, anhydraulically actuable piston operatively connected with the slide forshifting same, an hydraulically actuable piston for moving the truingtool holder, a hydraulic pressure source, conduits therefor extending tothe pistons, a single valve controlling the flow of the pressure sourcethrough the conduits, and a control member mounted on the bed foractuating the valve.

6. In the machine tool organization the combination of a bed, a grindingWheel rotatably supported thereby, a bracket adjacent the grindinglwheelandy having a guide way thereon, a slide su ported by the bracket andmovable longitudinally of the guide way, a trning tool holder on theslide and movable transversely thereof, an hydraulically actuable pistonoperatively connected with the slide for shifting same, an hydraulicallyactuable 'iston for moving thetruing tool holder, a ydraulic pressuresource, conduits therefor and extending to the pistons, a single sLeonesa valve controlling the iow of the pressure source through theconduits, a control member mounted on the bed for actuating the valve, athrottle mechanism including a second valve for controlling the rate offlow of the pressure source, and means connected with the control memberfor actuating the throttle mechanism valve whereby a common control forthe direction and throttle valves is provided.

.7. In the machine tool organization the combination of a bed, agrinding wheel rotatably. supported thereby, a bracket adjacent thegrinding wheeland having a. guide way thereon, a slide supported by thebracket and movable longitudinally of the guide way, a truing toolholder on the slide and movable transversely thereof, an hydraulicallyactuable pistou operatively connected with the slide for shifting same,an hydraulically actuable piston for moving the truing tool holder, ahydraulic pressure source, conduits therefor and extending to thepistons, a single valve controlling the tiow of the pressure sourcethrough the conduits, a control member mounted on the' bed for actuatingthe valve, a throttle mechanism including a second valve for controllingthe. rate of flow of the pressure source, 'means connected with thecontrol member for actuating the throttle mechanism' valve whereby acommon control for the direction and er, a hydraulic medium un'derpressure, a

pair of conduits for the medium, said conduits being branched at one endthereof and respectfully connected with the slide and truing tool holderpistons whereby they are simultaneously actuated, and a single valve fordirecting the hydraulic source to either conduit for actuating thepistons simultaneously in either direction.

9. In a device of the class described'the combination of a rotatablegrinding wheel, :1 support adjacent the actiue tace of the grindingwheel, a slide on the support and movable traversely thereof, a truingtool holder on the slide andinovnble transversely ofthe slide,hydraulically actuable pistons for actuating the slide and truingtoolholder, a hydraulic medium under pressure, a

pair of conduits for the medium, said e011-,

duits being branched at one end thereof and respectfully connected withthe -slide and monaca 'simultaneously' actuated, a single valve fordirecting the hydraulic sourceto either conduit for actuating thepistons simultaneously in either direction, a second valve in one of theconduits for varying the rate of flow of the hydraulic mediumtherethrough and consequently varying the rate of movement of the slideor truing tool holder, and a levercommon to both valves rand shiftablein different directions for controlling the' said valves. y v

l0. ln a device of the class described the combination of a. rotatablegrinding Wheel,

asupport adjacent the -active face of the grinding wheel, a slide on thesupport and movable traversely thereof, a truing tool holder on theslide and movable transversely oi the slide, hydraulically actuahlepistons for actuating the slide and truing tool holder, a hydraulicmedium under pressure, a pair oi conduits for the medium, said conduitsbeing branched at one end thereora and rel spectiully connected with theslide and truing tool holder pistons whereby they are simultaneouslyactuated, a. single valve for diel rooting the hydraulic source toeither conduit for actuating the pistons simultaneosuly in eitherdirection, a second valve in one of the conduits for varying the rate offlow ci the hydraulic medium therethrough and concombination oi a bed, agrinding wheel ron tatably mounted thereon, a guideway adjacent thegrinding Wheel and extending transversely thereof, a slide mountedthereon for movement relative thereto, atruing, tool mounted on theslide for movement toward the grinding wheel, hydraulic means forshifting the slide, a screw carried by the slide having an operativecoupling with the tool, a reciprocating rack supported by the slide, asegmental gear journaled on the slide and operatively coupled with therack, a

' ratchet secured to the screw, and a paWl on the segmental gear Jforengagement with the rack whereby reciprocations of the rack andoscillations/,of the gear through the ratchet and pawl incremently feedthe tool toward the grinding wheel for each reciprocation of the rack.

l2. ln a machine tool organization the combination of a bed, a grindingWheel rotatably mounted thereon, a guidetvay adjacent the grinding Wheeland extending transversely thereof, a slide mounted thereon for movementrelative thereto, a truing tool mounted on the slide *for movementtoward the grinding ivvheel, hydraulic means for shifting the slide, ascrevv carriedloy the slidehaving an operative coupling vvithV the tool,a reciprocating rack supportedloy the v slide, a segmental gearjournaled on the slide an'd operatively 'coupled with the raclr, aratchet secured to the screw, a pawl on the segmental gear forengagement with the raclr whereby reciprcations ofthe raclr and oscil-Ilations of the` gear through the ratchet and `liti pawl incremently feedthe tool tov/'ard the grinding wheel or each reciproc'ation oil rack,means for disengaging the 'ratchet 'and vpawl when the rachis at one endoi its move nient, and manual' meansl'or actuating the screvv when theratchet and pavvl are disen gaged. I

13. lln a machine tool organization' the combination of a hed, agrinding vvheelnoa tatably mounted thereon, a guidevvay adjap cent thegrinding wheel and extending trans versely thereof, a slide mountedthereon :lor movement relative thereto, a truing tool mounted on ftheslide for movement toward the grinding wheel, hydraulic means riorshifting the slide, a screw carried by the slide having an operativecoupling with the toch/a reciprocating rack supported by the slide, asegmental gear journaled on the slide and operatively coupled with therack', a l.

ratchet secured to the screw, a parvl on ,Sill

segmental gear .for engagement vvith the racl whereby reoiprocations ofthe raclr and oscillations of the gear through the ratchet and pawlincremently feed the tool toward the grinding Wheel for eachreciprocation of the'raclr, and hydraulic means for reciprou eating therack,

y il.. ln a truing mechanism ci the classde scribed the combination`with a grinding Wheel, of a slide support adjacent the grirnla ingWheel, a slide on the support tor tranela-i v tion relative thereto, atruing tool mounted on the slide for movement toward the grinding lll@wheel, an hydraulic piston connected vvith'lv the slidean hydraulicpiston for feeding the tool toward the grinding Wheel, a single sourceof hydraulic pressure for actuating said pistons, a conduit extendingfrom the single source of pressure to one end oil each piston, a valvein said conduit for reversing the dow of the pressure through theconduit, a second valve for controlling the rate oil flow ofsaidpressure in said conduit, means for adjustably determining the positionoi said rate control valve, a lever operable in one direction foraxially shifting said reversw ing valve, and means connecting said leverwith the rate control valve whereby operation thereof in an angularlyrelated direction ren-a ders .the adjusting means inoperative..

l5. ln a truing mechanism oit the class described. the combination witha grinding wheel, of a slide support adjacent thegrindn ing Wheel, aslide on the support for inanslau ldti tion relative thereto, a truingtool mounted on the slide for movement toward the grinding wheel, anhydraulic piston connected with the slide, an hydraulic iston forfeeding the tool toward the grind,

source of hydraulic pressure for actuating said pistons, a conduitextending from the single source of pressure to one' end of each piston,a valve in said conduit for reversing the flow of the pressure throughthe conduit, a second valve for controlling the rate of flow of saidpressure in said conduit, means for adjustably determining the positionof said rate control valve, a lever operable in one direction foraxially shifting said revers ing valve, and means connecting said leverwith the rate control valve whereby operation thereof in an angularlyrelated direction -renders the adjusting means inoperative, saidconnection comprising a plunger abutting onV one end with the lever andon the other end with a pivoted beam, and a. second plunger abutting onopposite ends with the beam and rate control valve.

In testimony whereof we aliix our signa- FREDERICK s. HAAS. CLEMENTBoofrH.

lng wheel, a sin le

